Cutter-chain.



N. D. LEVIN. CUTTER CHAIN. APPLICATION FILED MAY 6,1908,

Patented Jan. 4, 1910.

"un'rran s ratus raruntr tilil it fitt.

'NILS DAVID LEVIN, 0F COLUMBUS, OHIO.

CUTTER-CHAIN.

To all whom it may concern:

Be it known that l, l\"n.s 1). LEVIN, a citi' zen of the United States,residing at Colum bus, in the county of Franklin and State of Ohio, haveinvented certain new and use lul Improvements in Cilttei'-(1liaiI1s, ofwhich the following is a specification.

The invention relates to chains tor supporting coal bits and similarcutting members. The invention has for its primary an jects; theprovision of improved means for preventing the bits from tiltingbackwardly during the cutting operation, and of means whereby thecutters may be held in a predetermined position relative to the materialto be cut. One embodiment of the. invention is illustrated in theaccompanying drawings,

wherein z- Figure 1 is a side elevation of the chain. F'gures 2 and 3are sections on the lines IIII and III-III respectively of Fig;-

. ure 1.

c Figure 4 is a plan view of the chain.

Figure 5 is a side elevation of a moditicd form of chain.

Figure 6 is a. transverse section through Figure 5 on the line VL- VI,and

Figure 7 is a side elevation of another modified form of chain.

Referring first to the construction shown in Figures 1, 2, 3 and l, 1-1are the cutter supporting links or blocks, which blocks carry the bitsor cutters 2--2 and 3, .4 are the set screws for holding the cutters inposition, 5 are the side plates constituting the links intermediate thecutter supporting blocks 1, and 6 are bracing struts prele ably madeintegral with the cutter blocks and extending; rearwardl therefrom,which struts are provided wit the transverse end pieces 7 for engagingthe top of the adjacent links 5-5.

It will be seen that in the operation of the chain, the resistance ofthe material being ant 3 backwardly especially when an unusually hardbody of material is encountered. In such backward tilting the blockmoves about a pivotpoint located behind the cutter, which causes the bitto rise and dig into the coal and break. The purpose of the rearwardlyextending struts 6 is to prevent this back ward tilting of the cutters,and so insure Specification of Letters Iate nt. Application filed May 6,1908. Serial No. 481,154.

i 1 t I i l Patented Jan 4, 1910.

a more rapid and uniform reduction of the material operated.upon, andprevent undue strain on the chain bits and other parts of the machine. i

it will also be seen that by oppositely disposing certain of the cuttersin pairs, each one ot' which is equidistant from the vertical axis ofthe cutter block, in combination with the bracing struts rcl'crred to,balances the chain in such a manner that not only is rearward but alsosidcwisc tilting obviated, and the entire series ot cutters hcld. in apredcterinined position relative to the material to be cut.

In Figures 5 and (l a modified arrangement is shown wherein additionalbracing struts projecting from the trout sides of the cutter blocks lare provided. 'Ihecnds of both the 't'oru'ardly and rearwari'lltextending struts are provided with cross pieces 7 corresponding to themembers 7 in the other form oi, device, and in other respects theconstruction is similar to the construc tion of Figures 1, 3, and t.

In Figure 7 another modilied arrangement is shown wherein the bracingstrut J, preferably made integral withthe cutter block and extendingrearwardly therefrom, rests upon the top of the following cutter block,10.

Having thus described my invention and illustrated its use, what I claimas new and desire to secure by Letters Patent is the followingzy 1. incombination in a cutter chain, a pin-- ralit'y of links, cutter blocksintermediate the links and having projecting portions extending out pastthe outer edges of the links, braciilg struts on the projecting portionsextendingrearwardly therefrom and engaging the outer edges of the links,and cutters mounted in the cutter blocks.

2. The combination with a chain compris ing blocks each carrying anoutstanding cutter and pairs of UPI'JOSlIlg side bars constitutingintermediate links, ofbracing'means for the cutter blocks comprisingrearwardly extel'uling struts with engaging portions at their rear endsin position to engage the outer sides of both of the opbositc side bars.

3. The combination with a chain having cutter SUIHXHUHQ links and pairsof opposof forwardly and reerwardiy extending the blocks to the tops ofthe connecting bracing means on each cutter supporting link withengaging portions at their ends ada ted to engage the upper sides ofboth of t e opposing side bars between their ends. 4. In combination ina cutter chain, bit

I blocks, connecting links alternating with the bit blocks pivotallyjointed to the ends of the blocks, bits in the blocks, between thepivotal connections thereof, and bracing means independent of the jointsextending fromlinks.

In testimony whereof I have hereunto signed my name in the presence ofthe sub- 15 scribing witnesses.

NILs DAV-ID LEVIN.

Witnesses:

G- W. CUNNINGHAM, ALEXANDER P. LINDSAY, PAUL CARPENTER.

